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Water & Wastewater Operator (WPI/ABC Class I) — Practice Exam

WD equipment: repair: practice questions

Our Water/Wastewater Operator bank has 6 questions on this topic. Here are 4 of them with answers; the full mock exam draws from every topic, like the real one.

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Question 1 · Water Distribution Class I

What should be done before digging to repair a main?

  1. Start digging immediately and watch for warning tape, since most utilities are buried shallow
  2. Call 811 or the one-call center so other utilities are located and marked
  3. Ask the homeowner where lines are
  4. Start digging immediately and look for warning tape
Show the answer

B. Call 811 or the one-call center so other utilities are located and marked — Underground locating is in the outline.

Question 2 · Water Distribution Class I

Why is it important to keep pressure in the main during a repair when possible?

  1. Positive pressure helps keep trench water out of the pipe
  2. It speeds up repair
  3. It speeds up the repair and saves chlorine during the job
  4. It lowers water age
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A. Positive pressure helps keep trench water out of the pipe — Pumping the trench below the pipe also helps.

Question 3 · Water Distribution Class I

What color is typically used to mark potable water lines when locating?

  1. Yellow
  2. Green
  3. Red
  4. Blue
Show the answer

D. Blue — APWA uniform color code: red electric, yellow gas, green sewer.

Question 4 · Water Distribution Class I

What color marks sewer lines in the uniform locating color code?

  1. Green
  2. Orange
  3. Blue
  4. Red
Show the answer

A. Green — Orange is communications.

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